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Holdawayite

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About HoldawayiteHide

Formula:
Mn6(CO3)2(OH)7(Cl,OH)
Colour:
light to bright pink
Lustre:
Vitreous
Hardness:
3
Specific Gravity:
3. 19 - 0
Crystal System:
Monoclinic
Name:
Named in honor of Michael Jon Holdaway (b. 1936), professor of petrology and Southern Methodist University, Dallas, Texas, USA, for his contributions to mineralogy ind petrology and for his efforts as editor of the American Mineralogist.
This page provides mineralogical data about Holdawayite.


Classification of HoldawayiteHide

Approved
Approval year:
1986
First published:
1988
5.BA.20

5 : CARBONATES (NITRATES)
B : Carbonates with additional anions, without H2O
A : With Cu, Co, Ni, Zn, Mg, Mn
16b.4.2.2

16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
4 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:1
11.12.2

11 : Carbonates
12 : Carbonates of Mn

Physical Properties of HoldawayiteHide

Vitreous
Transparency:
Translucent
Colour:
light to bright pink
Comment:
It gradually changes to a brown color on exposure and in some cases has developed a thin black sooty coating that masks the true color
Streak:
light pink
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
{100}
Density:
3. 19 - 0 g/cm3 (Measured)    3.24 g/cm3 (Calculated)

Optical Data of HoldawayiteHide

Type:
Biaxial (-)
RI values:
nα = 1.644(1) nβ = 1.719(1) nγ = 1.721(1)
2V:
Measured: 12° to 18°, Calculated: 16°
Max Birefringence:
δ = 0.077
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong
Pleochroism:
Non-pleochroic

Chemical Properties of HoldawayiteHide

Formula:
Mn6(CO3)2(OH)7(Cl,OH)
IMA Formula:
Mn2+6(CO3)2(OH)7(Cl,OH)

Crystallography of HoldawayiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 23.437(5) Å, b = 3.3137(3) Å, c = 16.618(6) Å
β = 111.15(2)°
Ratio:
a:b:c = 7.073 : 1 : 5.015
Unit Cell V:
1,203.67 ų (Calculated from Unit Cell)
Z:
4

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001165HoldawayitePeacor D R, Rouse R C (1988) Holdawayite, Mn6(CO3)2(OH)7(Cl,OH), a structure containing anions in zeolite-like channels American Mineralogist 73 637-64219880293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.93 Å(100)
7.77 Å(40)
5.459 Å(80)
3.879 Å(70)
2.926 Å(40)
2.690 Å(60b)
2.589 Å(50b)

Type Occurrence of HoldawayiteHide

General Appearance of Type Material:
subhedral crystals approximately 2 cm in diameter
Place of Conservation of Type Material:
Type material is deposited at the Smithsonian Institution under catalogue no 163209 and at the National Museum of Natural History, Ottawa, under NMNS no 51510
Geological Setting of Type Material:
tectonically intercalated manganese and iron ores, which are locally dominated by carbonate- and silicate-facies rocks rather than by the more usual hausmannite ores.
Associated Minerals at Type Locality:
Reference:
Peacor, D.R., Essene, E.J., Rouse, R.C., Dunn, P.J., Nelen, J.A., Grice, J.D., Innes, J., von Knorring, O. (1988) Holdawayite, a new manganese hydroxyl-carbonate from the Kombat mine, Namibia. American Mineralogist: 73: 632-636.

Synonyms of HoldawayiteHide

Other Language Names for HoldawayiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
4 photos of Holdawayite associated with AllactiteMn2+7(AsO4)2(OH)8

Related Minerals - Nickel-Strunz GroupingHide

5.BA.05AzuriteCu3(CO3)2(OH)2Mon. 2/m : P21/b
5.BA.10GeorgeiteCu2(CO3)(OH)2 · 6H2OAmor.
5.BA.10Glaukosphaerite(Cu,Ni)2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10KolweziteCuCo(CO3)(OH)2Tric.
5.BA.10MalachiteCu2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Mcguinnessite(Mg,Cu)2(CO3)(OH)2Mon. 2/m
5.BA.10NullaginiteNi2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10PokrovskiteMg2(CO3)(OH)2Mon.
5.BA.10Rosasite(Cu,Zn)2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.10Zincrosasite(Zn,Cu)2(CO3)(OH)2Mon.
5.BA.10ChukanoviteFe2+2(CO3)(OH)2Mon. 2/m : P21/b
5.BA.15Aurichalcite(Zn,Cu)5(CO3)2(OH)6Mon. 2/m : P21/m
5.BA.15HydrozinciteZn5(CO3)2(OH)6Mon. 2/m : B2/m
5.BA.25DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (xOrth. mmm (2/m 2/m 2/m) : Pnma
5.BA.25UM1977-03-COSiO:CaClHCa10-11(CO3)7(SiO4)Cl1-2(OH)1-2Mon.
5.BA.30Loseyite(Mn2+,Zn,Mg)4Zn3(CO3)2(OH)10Mon. 2/m
5.BA.30SclariteZn7(CO3)2(OH)10Mon. 2/m : B2/b

Related Minerals - Dana Grouping (8th Ed.)Hide

16b.4.2.1DeferniteCa6(CO3)2-x(SiO4)x(OH)7(Cl,OH)1-2x (xOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

11.12.1RhodochrositeMnCO3Trig. 3m (3 2/m) : R3c
11.12.3DesautelsiteMg6Mn3+2(OH)16[CO3] · 4H2OTrig. 3m (3 2/m)
11.12.4KutnohoriteCaMn2+(CO3)2Trig. 3 : R3

Fluorescence of HoldawayiteHide

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for HoldawayiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Peacor, D.R., Essene, E.J., Rouse, R.C., Dunn, P.J., Nelen, J.A., Grice, J.D., Innes, J., von Knorring, O. (1988) Holdawayite, a new manganese hydroxyl-carbonate from the Kombat mine, Namibia. American Mineralogist: 73: 632-636.
Peacor, D.R., Rouse, R.C. (1988) Holdawayite, Mn6(CO3)2(OH)7(Cl,OH), a structure containing anions in zeolite-like channels. American Mineralogist: 73(5-6): 637-642.
Dunn, P.J. (1991) Rare minerals of the Kombat mine. The Mineralogical Record: 22: 421-425.
Mernagh, T.P., Kamenetsky, V.S., Kamenetsky, M.B. (2011) A Raman microprobe study of melt inclusions in kimberlites from Siberia, Canada, SW Greenland and South Africa. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy: 80(1): 82-87.

Internet Links for HoldawayiteHide

Localities for HoldawayiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Rhineland-Palatinate
    • Rhein-Lahn District
Wittern: "Mineralfundorte in Deutschland", 2001
        • Frücht
Der Aufschluss Vol.55, March/April 2004
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein
      • Kombat
Peacor, D.R., Essene, E.J., Rouse, R.C., Dunn, P.J., Nelen, J.A., Grice, J.D., Innes, J., von Knorring, O. (1988) Holdawayite, a new manganese hydroxyl-carbonate from the Kombat mine, Namibia. American Mineralogist: 73: 632-636.
Romania
 
  • Maramureș
    • Târgu Lăpuș
http://minerals-of-the-carpathians.eu; Udubasa, G., Hartopanu, P., Ilinca, G. (1996). The Regionally metamorphosed Fe-Mn Ore Deposit at Razoare, Preluca Mts., Romania. Romanian Journal of Mineralogy, 77, 3-20.
 
Mineral and/or Locality  
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